I'm also having this issue running 2.4-40300 or 2.5-40300. It won't log any bosses near as I can tell. Normally when I click on a boss, I get a message that logging was started since I have verbose on and I was getting nothing. Switched down to 2.3b-40300 and it seems to work again.

At any rate, I do really like the addon as it's nice when all you want to log is raid fights, so thanks for creating it!

I updated to the recent version you uploaded, and it worked like a boss up until Ultraxion. I have logs for Morchok 10N, Yor'sahj 10N, Warlord Zon'ozz 10N, Hagara the Stormbinder 10N, and then it just stopped. We got 7/8 down and put in a good number of attempts on Madness, but no logs. I didn't notice any problem until after raid.

Is it working for your guild?
If so, any idea how I may have managed to do it wrong?

SET CombatLogRangeParty "200"
SET CombatLogRangePartyPet "200"
SET CombatLogRangeFriendlyPlayers "200"
SET CombatLogRangeFriendlyPlayersPets "200"
SET CombatLogRangeHostilePlayers "200"
SET CombatLogRangeHostilePlayersPets "200"
SET CombatLogRangeCreature "200"

But I dont know if these effect anything. Do you know something about them?

Also I dont think logging did stop to early in my case. It started to late. I asked you if you could add detection of a Boss not just by mouse over, but by target of target also.